Every computed fundamental quasinormal frequency for polar metric-dilaton perturbations of dilaton-Euler-Heisenberg black holes has a negative imaginary part, meaning the modes are damped, with ε=+1 and ε=−1 differing in damping near extremality.
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Polar perturbations of dilaton-Euler-Heisenberg black holes
Every computed fundamental quasinormal frequency for polar metric-dilaton perturbations of dilaton-Euler-Heisenberg black holes has a negative imaginary part, meaning the modes are damped, with ε=+1 and ε=−1 differing in damping near extremality.